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In Case You Missed It:

In the journals: Link between calcium supplements and heart attack risk unclear

Published: October, 2010

Older people who take calcium supplements have a 30% increased
risk of heart attack, according to a meta-analysis (a review of
multiple studies) published online July 29, 2010, in the medical
journal BMJ. But another meta-analysis, published by
Harvard researchers in Annals of Internal Medicine
(March 2, 2010), found that calcium supplements had no effect on
cardiovascular events. These conflicting findings have raised
questions for clinicians and women, including readers of
Harvard Women's Health Watch. Postmenopausal women are
generally urged to get adequate calcium through diet and
supplements to help protect against osteoporosis and bone
fractures. Many now want to know if they should stop taking
calcium supplements. The short answer is no, though you should
probably get most of your calcium from foods.

The BMJ study

New Zealand researchers analyzed data from 11 randomized trials
involving 11,921 participants who were assigned to receive either
calcium supplements or a placebo for at least four years. In nine
studies, the daily calcium supplement dose was 1,000 milligrams
(mg) or more; in the other two, it was 500 mg and 600 mg.